package cn.itcast.gateway;

import org.springframework.cloud.gateway.filter.GatewayFilter;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.stereotype.Component;
import org.springframework.util.MultiValueMap;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

//@Order(-1)
@Component
public class AuthorizeFilter implements GatewayFilter, Ordered {

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //获取请求参数
        ServerHttpRequest request = exchange.getRequest();
        MultiValueMap<String, String> map = request.getQueryParams();
        //获取参数中的 authorization 参数
        String auth = map.getFirst("authorization");
        //判断参数是否等于 admin
        if ("admin".equals(auth)) {
            //相等则放行
            return chain.filter(exchange);
        }else {
            //不等则拦截
            //设置状态码
            exchange.getResponse().setStatusCode(HttpStatus.UNAUTHORIZED);
            return exchange.getResponse().setComplete();
        }
    }

    @Override
    public int getOrder() {
        return -1;
    }
}
